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Other Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Summary of other liabilities    
Membership Rewards liability $ 7,751 $ 7,060
Book overdraft balances 2,837 2,255
Employee-related liablities 2,277 2,055
U.S. Tax Act Deemed Repatriation of Taxes 1,703  
Rebate and reward accruals 1,564 1,382
Deferred card and other fees, net 1,554 1,411
Other 4,462 4,614
Total $ 22,148 $ 18,777